화학공학소재연구정보센터
Journal of Materials Science, Vol.55, No.26, 12031-12040, 2020
Efficient polysulfide anchor: brain coral-like WS2 nanosheets
Controlling the inherent polysulfide shuttle process has been the key research topic to solve the irreversible capacity loss problem of Li-S battery. By skillfully designing, hierarchical brain coral-like WS2 nanosheets are synthesized. The novel structure is consisted of WS2 nanosheets arrayed along the same crystal plane, which expose a large number of adsorption active sites and enhance the adsorption of polysulfides. At the same time, the multilayer sheet structure has a large specific surface area and increases the sulfur loading. The brain coral-like WS2/S cathode exhibits excellent electrochemical properties, which delivers an initial discharge specific capacity of 1308 mAh g(-1) at 0.1 C. And when cycles at 2 C, the discharge specific capacity is maintained at 721 mAh g(-1) after 500 cycles, together with a low decay of 0.06% per cycle.